GoXDCR: panic (bad map state) from goxdcr/service_impl.(*ThroughSeqnoTrackerSvc).getThroughSeqnos

Build

4.0.0-2020

fatal error: bad map state

goroutine 779972 [running]:
runtime.gothrow(0x9c0810, 0xd)
/usr/local/go/src/runtime/panic.go:503 +0x8e fp=0xc2097e4c98 sp=0xc2097e4c80
runtime.evacuate(0x816b60, 0xc20b289890, 0x12)
/usr/local/go/src/runtime/hashmap.go:799 +0x36a fp=0xc2097e4d58 sp=0xc2097e4c98
runtime.growWork(0x816b60, 0xc20b289890, 0x57)
/usr/local/go/src/runtime/hashmap.go:769 +0x8a fp=0xc2097e4d78 sp=0xc2097e4d58
runtime.mapassign1(0x816b60, 0xc20b289890, 0xc2097e4e3e, 0xc2097e4e80)
/usr/local/go/src/runtime/hashmap.go:408 +0x18f fp=0xc2097e4e18 sp=0xc2097e4d78
github.com/couchbase/goxdcr/service_impl.(*ThroughSeqnoTrackerSvc).GetThroughSeqno(0xc2660dc400, 0xc270a800a9, 0x0)
/home/couchbase/jenkins/workspace/sherlock-unix/goproj/src/github.com/couchbase/goxdcr/service_impl/through_seqno_tracker_service.go:158 +0x504 fp=0xc2097e4eb8 sp=0xc2097e4e18
github.com/couchbase/goxdcr/service_impl.(*ThroughSeqnoTrackerSvc).getThroughSeqnos(0xc2660dc400, 0x8, 0xc2190504c0, 0x14, 0x120, 0xc270a82720, 0xc2432b3d20)
/home/couchbase/jenkins/workspace/sherlock-unix/goproj/src/github.com/couchbase/goxdcr/service_impl/through_seqno_tracker_service.go:212 +0x2cc fp=0xc2097e4fa8 sp=0xc2097e4eb8
runtime.goexit()
/usr/local/go/src/runtime/asm_amd64.s:2232 +0x1 fp=0xc2097e4fb0 sp=0xc2097e4fa8
created by github.com/couchbase/goxdcr/service_impl.(*ThroughSeqnoTrackerSvc).GetThroughSeqnos
/home/couchbase/jenkins/workspace/sherlock-unix/goproj/src/github.com/couchbase/goxdcr/service_impl/through_seqno_tracker_service.go:182 +0x27a